[gnome-builder] meson: handle empty strings for config-opts

[Christian Hergert <chergert src gnome org>]

commit 5f5c400ef1227307199e83b35df83f42f4e2b155
Author: Christian Hergert <chergert redhat com>
Date:   Sun Oct 22 00:35:09 2017 -0700

    meson: handle empty strings for config-opts

 src/plugins/meson/gbp-meson-pipeline-addin.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/meson/gbp-meson-pipeline-addin.c b/src/plugins/meson/gbp-meson-pipeline-addin.c
index d1f748b..0a8636a 100644
--- a/src/plugins/meson/gbp-meson-pipeline-addin.c
+++ b/src/plugins/meson/gbp-meson-pipeline-addin.c
@@ -119,7 +119,7 @@ gbp_meson_pipeline_addin_load (IdeBuildPipelineAddin *addin,
   ide_subprocess_launcher_push_argv (config_launcher, "--prefix");
   ide_subprocess_launcher_push_argv (config_launcher, prefix);
 
-  if (config_opts != NULL)
+  if (!ide_str_empty0 (config_opts))
     {
       g_auto(GStrv) argv = NULL;
       gint argc;